<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <form action="/login" method="post">
        <div class="dandan">
            <input type="text" name="username" id="username" placeholder="输入用户名">
        </div>
        <div class="dandan">
            <input type="text" name="password" id="password" placeholder="输入密码">
        </div>
        <input type="submit" name="" value="点击登录">
    </form>
</body>
</html>